dango ;
only chases the balldefender ; keeps the position
between the ball and theown goal midfielder ; chases the ball if the
ball is in the midfield, else surrounds in the
midfield. left_wingback ; covers the left
side.right_wingback ; covers the right
side.forward ; waits the ball in the
opponent-team-side.top ; waits the ball in front of the
opponent goal.